Question about toroidally bent crystal in Laue geometry
luweb opened this issue · comments
Hello, I was wondering if there is a way I could get a toroidally bent crystal in Laue geometry. I couldn't find that specific option built into oes, but is there an alternative approach you would suggest? I am asking because I am trying to simulate sagittal focusing with asymmetric Laue crystals.
Thank you very much for your support.
Best Regard,
Lucas
Hi,
See the docs for BentLaue2D class and an example for it: examples/withRaycing/03_LaueMono/04_sagittal_bending.py.
Thank you Konstantin, that is very helpful. After playing with the BentLaue2D class I just have one more follow up question: Is there a built-in way to vary the sagittal bending radius? Or any alternative strategy to accomplish that? I was thinking about stacking multiple bent crystals together with different radii, but I am not sure if that is the best approach. Thank you!
The easiest way is to assign to the Rs field of the optical element instance a new value. The best place for this is in a generator where you can loop over a list of predefined values. Look for generator in the supplied examples.
From what I understood about the generator is that it automatizes a sequence of ray tracing runs. Sorry for not being clear before, but what I meant by varying the sagittal bending radius was varying with respect to energy, so that rays of different energies will "see" different radii. The final geometry would be a "warped" toroid. Is it possible to implement something like that in xrt with generator or another method?
You are free to implement any geometry by defining two methods: local_z(x, y) for surface height and local_n(x, y) for surface normal. If you don't want a double parabolic shape, you don't need this class (BentLaue2D), just build your own.
Got it, thank you very much for the guidance, I will try that!